It has a wide range of capabilities . By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Instead of creating the empty list first and appending inside your own loop, you can just use a list comprehension. Two ways to read file into list in python (note these are not either or) -. Every ingredient ends in the \n character. This is a simple way to convert a file to a list. This method splits strings into a list at a certain character. And you can see that we successfully read a file content into the list. Basemap Folium GeoPandas Plotly Basemap The basemap toolkit which can be found under mpl_toolkits is matplotlib's main visualization tool. Python Read File Into List Using with Keyword We can use the with keyword provided by python for our job. The easiest way to work with CSV files in Python is to use the pandas module. Why is Singapore currently considered to be a dictatorial regime and a multi-party democracy by different publications? Steps for reading a text file in Python To read a text file in Python, you follow these steps: First, open a text file for reading by using the open () function. Step 1: The file needs to be opened for reading using the open () method and pass a file path to the function. To enable the reading and writing of files programming languages provide File I/O libraries with inbuilt methods that allow the creation, updation as well as reading of data from the files. To read a file in Python, use the file.read () function. Third, close the file using the file close () method. The characters are represented as a list of values by splitting on a delimiter. How to set a newcommand to be incompressible by justification? import ast with open ("contacts.txt") as file1: contact_list = ast.literal_eval (file1.read ()) print (contact_list [0]) Alternately, you could save in another format such as . The second list contains all the quantities from our file. Save my name, email, and website in this browser for the next time I comment. This method also returns a list of all the lines in the file. rev2022.12.9.43105. Basically we will feed our new Python script with that CSV file to read usernames or user. I've tried using open but it gives me invalid syntax (the file name I chose was "numbers" and it saved into "My Documents" automatically, so I tried open(numbers, 'r') and open(C:\name\MyDocuments\numbers, 'r') and neither one worked). This method will open a file and split its contents into separate lines. If the values of the list are all python literals (string, int, float, etc), then you can have python parse them again. If set, autodoc will generate document for the members of the target module, class or exception. The Best Practice of Reading Text Files In Python | by Christopher Tao | Towards Data Science 500 Apologies, but something went wrong on our end. How do I make a flat list out of a list of lists? Here are the most popular python libraries to plot geo data on a map. The pythonic way to read a file and put every lines in a list: from __future__ import with_statement #for python 2.5 with open ('C:/path/numbers.txt', 'r') as f: lines = f.readlines () Then, assuming that each lines contains a number, numbers = [int (e.strip ()) for e in lines] Share Follow answered Oct 13, 2010 at 18:41 ohe 3,311 3 25 50 1 How do I concatenate two lists in Python? You just read that data from a file. This module is widely used by the developers when they work to logging. i.e. Here's our task: We have a text file containing numerical data. The dividing point is the comma followed by a space on each line: The for loop lets us read our file line by line. In this article, we will see how to plot latititude, longitude from csv using Python. It's sometimes important to move this cursor around without making any variable read or write every time, and for this purpose, there is a seek() function available to move to the desired location within a file. This is not quite the output we are expecting. Python3 f = open('gfg.txt', 'r') print(f.read ()) f.close () Output: James Gallagher is a self-taught programmer and the technical content manager at Career Karma. The solution I just implemented is a hybrid of the two. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Python provides a built-in function that helps us open files in different modes. Open-source software (OSS) is computer software that is released under a license in which the copyright holder grants users the rights to use, study, change, and distribute the software and its source code to anyone and for any purpose. How do I check whether a file exists without exceptions? How do I arrange multiple quotations (each with multiple lines) vertically (with a line through the center) so that they're side-by-side? To read a file in Python, use the file.read() function. In this guide, we discuss how to use the split() method to read a text file into a list. Next, we print those lines to the console. The split() method returns the list of strings after breaking the given string by a specified separator. Why is the eastern United States green if the wind moves from west to east? Connecting three parallel LED strips to the same power supply. To summarize a bit from what people have been saying: If you wish have something in place similar to a try/catch, I think @movieyoda code is probably what you should use however. If you see the "cross", you're on the right track. An application program ( software application, or application, or app for short) is a computer program designed to carry out a specific task other than one relating to the operation of the computer itself, [1] typically to be used by end-users. +1 for the with statement usage; though his school would have to be really behind the times for him to have to use a, this leaves a newline at the end of each element, this answer is a duplicate of other answers and was given 3+ years later nothing new added, this "summary" provides nothing new and gives information that doesn't relate to the question. The with block ensures that once the entire block is executed the file is closed automatically. You can see that we read the text file into a list using the file.readlines() function in one step. Ingredients and their quantities are not separate. Learn how your comment data is processed. I was showing that Sample 3 is more memory efficient than collecting all data in a list. We do this on the as_list[1] value which correlates to the name of each ingredient. Steps to Write List to a File in Python Python offers the write () method to write text into a file and the read () method to read a file. [2] Word processors, media players, and accounting software are examples. Here you will learn alternative ways of getting file data and convert it to a list. (@sha it is noted that it doesn't close the file.). Python Server Side Programming Programming f = open('my_file.txt', 'r+') my_file_data = f.read() f.close() The above code opens 'my_file.txt' in read mode then stores the data it reads from my_file.txt in my_file_data and closes the file. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide, It appears that you own the code that writes to the text file, in which case you should consider using a more exchangeable format such as JSON or YAML, or if your script is the only consumer of the file, consider a more space and time-efficient format such as. This code will remain indented because it is part of our open() block of code. Close the file by calling close () method on the file object. This means the open call should look like: I presume you're using XP because you call it My Documents - it changed in Vista and Windows 7. By using our site, you Krunal Lathiya is an Information Technology Engineer. Open file in read mode. readlines() returns a list containing one line per element. Options. There are three ways to read a text file in Python . Store textual dataset for binary classification, BeautifulSoup - TypeError: sequence item 0: expected str instance, Index out of range error when looping through file. Default is -1 which means the whole file. Amazon's newest Kindle is unlike any Kindle before it. Required fields are marked *. will document all class member methods and properties. Not the answer you're looking for? it's a memory efficient way to process data on the fly than storing the whole thing in a list and then processing it hence I present this at the last after answering his actual question. We can take advantage of shorter syntax to write our code with list comprehension. It is a comma-separated value inside the apple.txtfile. Assuming our data is stored in a text file in the following format -. What happens if you score more than 99 points in volleyball? The read function reads the whole file at once. To learn more, see our tips on writing great answers. How do I delete a file or folder in Python? When I try to print index 0 from the list it treats it like a string, You saved a string representation of the list. Read a text file into a string and strip newlines using file.read () and replace () In the problem above, you can see readlines () method has been used to read the data. How do I open a text file in Python? If the values of the list are all python literals (string, int, float, etc. Your email address will not be published. [duplicate]. As we mentioned before once you open a file there is a cursor that keeps moving once as you read or write. How can I randomly select an item from a list? without using the easy built-in Python tools. Read a CSV File Into a List of Lists Imagine you work with data from class exams. Help us identify new roles for community members, Proposing a Community-Specific Closure Reason for non-English content, How do i get elements from a file and read them to a list in python. file.readline () The readlines () method will read and return a list of all of the lines in the file. The file opened is closed using the close() method. if you have reasons to rely on just pure Pythonic ways, here's how! write () : Inserts the string str1 in a single line in the text file. Instead combining a list comprehension inside a "with" statement seems like the most idiomatic way to go. How to remove an element from a list by index. The file is opened with the open() method in w+ mode within the with block, the w+ argument will create a new text file in write mode with the help of write(). Full list with parameters can be found on the link or at the bottom of the post. How to make voltage plus/minus signs bolder? : @CoreyGoldberg I agree. The file opened is closed using the close () method. There is still one improvement that we need to make. He gave us that part. Help us identify new roles for community members, Proposing a Community-Specific Closure Reason for non-English content. One way to ensure that your file is closed is to use the with keyword. Did the apostolic or early church fathers acknowledge Papal infallibility? Get Matched. In Python 3.4. , we can use the Pathlib module to convert a file to a list. The open(filepath, mode) is used to open the required file in the desired mode. 1 with open('players.txt') as players_data: 2 players_data.read() python The open () function accepts an optional parameter that indicates how the file will be used. open () function returns a file object. The file is opened with the open() method in w mode within the with block, the argument will write text to an existing text file with the help of readlines(). the very simple answer - use the open [ 1] function : An open text file in Python actually appears like a list - so this is totally valid code and will display every line in the file, exactly as it appears in the file. read(): used to read data from the file opened using the open() method. Now, run the above file and see the output. Pathlib to Convert text file to list Python. Approach 1 is not very pythonic. The file method readlines()reads until EOF using readline() and returns a list containing the lines. In our previous examples, we've had to use a for loop to read the . Where is it documented? This could be considered inefficient as the file descriptor might not be closed immediately. How do I clone a list so that it doesn't change unexpectedly after assignment? Not sure if it was just me or something she sent to the whole team. Concentration bounds for martingales with adaptive Gaussian steps, Better way to check if an element only exists in one array. document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); Many careers in tech pay over $100,000 per year. In cPython (the regular interpreter version from python.org), it will happen immediately, since its garbage collector works by reference counting. However it does point out one obvious thing that might have been overlooked, and that's how to add "My Documents" to a filename. To read text file in Python, follow these steps. How do you read a file into a list in Python? You can use one of the following two methods to read a text file into a list in Python: Method 1: Use open () #define text file to open my_file = open ('my_data.txt', 'r') #read text file into list data = my_file.read() Method 2: Use loadtxt () from numpy import loadtxt #read text file into NumPy array data = loadtxt ('my_data.txt') A-143, 9th Floor, Sovereign Corporate Tower, We use cookies to ensure you have the best browsing experience on our website. We can remove this character by using the replace() method: In our for loop, we replace the value \n with an empty string. To read a text file into a list, use the split() method. Concentration bounds for martingales with adaptive Gaussian steps, If he had met some scary fish, he would immediately return to the surface, Better way to check if an element only exists in one array. The data read from the file is printed to the output screen using read () function. How could my characters be tricked into thinking they are on Mars? The first list is a list of all the lines of text in our file. Python: Read Text File into List James Gallagher Aug 25, 2020 Storing data in files lets you keep a record of the data with which a program is working. so let's see the below examples. We do not currently allow content pasted from ChatGPT on Stack Overflow; read our policy here. Why does the USA not have a constitutional court? I have no idea why that was mentioned at all), @CoreyGoldberg summaries generally don't provide new information, they simply summarize ;P. But FWIW the "new" info my answer has is around. One list contains the quantities of ingredients for a recipe. In Python 3.8 and up you can use a while loop with the walrus operator like so: with open (filename) as file: while (line := file.readline ().rstrip ()): print (line) Depending on what you plan to do with your file and how it was encoded, you may also want to manually set the access mode and character encoding: The file read () method can be used to read the whole text file and return as a single string. pandas.read_csv - Read CSV (comma-separated) file into DataFrame. First of all, its 10.2-inch e-ink display is giant. The modes define how we can access a file and how we can manipulate its content. open () function returns a file object. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. It is used by most of the third-party Python libraries, so you can integrate your log messages with the ones from those libraries to . Mathematica cannot find square roots of some matrices? I have text file coordinates.txt, which has data in the below format. On the Nitro Gifting page, press the 'Claim' button next to the . Not the answer you're looking for? Does a 120cc engine burn 120cc of fuel a minute? Example 2: C onverting a text file into a list by splitting the text on the occurrence of newline ('\n' ) The same process as before but we don't replace any string here. How do I get the number of elements in a list (length of a list) in Python? This character denotes a new line. Tabularray table when is wraped by a tcolorbox spreads inside right margin overrides page borders. Tap on your profile avatar at the bottom navigation bar and scroll down until you find the 'Nitro Gifting' option. Other alternatives include, but are not limited to, 'w' (open for writing in truncate mode) and 'a' (open for writing in append mode). Do bracers of armor stack with magic armor enhancements and special abilities. You have entered an incorrect email address. When the with ends, the file will be closed automatically for you. File_object.write (str1) writelines () : For a list of string elements, each string is inserted in the text file.Used to insert multiple strings at a single time. Python too offers inbuilt methods to perform file operations. It is seen as a part of artificial intelligence.Machine learning algorithms build a model based on sample data, known as training data, in order to make predictions or decisions without being explicitly . I want to prompt a user for a number of random numbers to be generated and saved to a file. also, watch your backslashes in windows path names, as those are also escape chars in strings. Then well split each line into two parts. The data read from the file is printed to the output screen using read() function. By default, autodoc will not generate document for the members that are private, not having docstrings, inherited from super class, or special members. I want to read coordinates in each line into python object list of list of float. The string split () is a built-in Python function that splits the string into a list. Machine learning (ML) is a field of inquiry devoted to understanding and building methods that 'learn', that is, methods that leverage data to improve performance on some set of tasks. If the entire content of the file is all on one line, the file.readlines() function will return the list containing one item instead of a list of individual elements. Lets start with a text file called grilled_cheese.txt. Then append each line from the text file to your list using a for loop. Remember to include the country code. The first value in as_list is the quantity of an ingredient. Find centralized, trusted content and collaborate around the technologies you use most. To read a file into a list in Python, use the file.read() function to return the entire content of the file as a string and then use the string.split() function to split a text file into a list. How do I include a JavaScript file in another JavaScript file? Now youre ready to read a text file into a list in Python like an expert. Converting strint to integers is easy: int("12"). @leoluk Rolled back your changes as it looks like that's the crux of the OP's problem. {'geek': 10, 'geeky': True} {'GeeksforGeeks': 'Education', 'geekgod': 101.0, 3: 'gfg'} {'supergeek': 5} The approach would include the following steps: Open the text file in . Central limit theorem replacing radical n with n. Is this an at-all realistic configuration for a DHC-2 Beaver? As joaquin noted, do not forget to f.close() the file. Now we have the file open and next we will read the data line by line from this file. Reading and writing files is an important functionality in every programming language. Whether it's writing to a simple text file, reading a complicated server log, or even analyzing raw byte data, all of these situations require reading or writing a file. I am aware its not what the person has asked. We would like to read the file contents into a Numpy array and a Python list. How to bring a list from a text file into python. AttributeError: 'list' object has no attribute 'splitlines', I don't know that the for loop is the most pythonic way to do this. The readlines() is a built-in Python method that returns a list containing each line in the file as a list element. This file contains the ingredients for a grilled cheese sandwich. To read files, use the readlines() method. read file into list python python by Man on Dec 03 2020 Comment 0 xxxxxxxxxx 1 with open('file1.txt','r+') as f: 2 lines=f.read().splitlines() 3 print(lines) 4 Add a Grepper Answer Answers related to "read space separated text file into list in python" how to take space separated input in python split string by spaces python The below steps show how to save Python list line by line into a text file. Python is no exception. Refresh the page, check Medium 's site status, or find something interesting to read. In the example above, we split a string into a list based on the position of a comma and a space (, ). We can also use the fdopen() method from the os module to read a file. Our code returns a list of each line in our file. To understand this example, you should have the knowledge of the following Python programming topics: Python File I/O Example 1: Using readlines () Let the content of the file data_file.txt be We can read data from a text file as a string and convert that data into a dictionary in Python. You can use forward slashes or double backslashes instead. Should teachers encourage good students to help weaker ones? Read a Text File to List in Python Using csv.reader () Function csv module is typically used to process the CSV file but could also be used to process the text file. 1. Python Program Read a File Line by Line Into a List In this example, you will learn to read a file line by line into a list. But that's not the only way. Additional Resources To learn more about related topics, check out the tutorials below: Python: Copy a File (4 Different Ways) Python Delete a File or Directory: A Complete Guide Python: Check if a File or Directory Exists In Python, to read a text file, you need to follow the below steps. Note that these lines contain the \n (newline-character) at the end of the line. This is true even if an exception is raised inside of it. To read a file into a list in Python, use the file.read () function to return the entire content of the file as a string and then use the string.split () function to split a text file into a list. To start, we declare two lists: quantities and ingredients. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. We do not currently allow content pasted from ChatGPT on Stack Overflow; read our policy here. @CoreyGoldberg please read my above comment. We can use readlines() to quickly read an entire file. Second, it now comes with a pen that . with open ("demo.txt") as file: print (file.read ()) The readline () method is going to read one line from the file and return that. The second column contains the name of an ingredient. Reading files in Python Method 1: Read a Text file In Python using read () The file is opened using the open () method in reading r mode. File of lists, import as individual lists in python 2.7, Strip file names from files and open recursively? Then we will open the file 'lang.txt' to start reading the content of the file. In this tutorial, you'll learn: What makes up a file and why that's important in Python By continuing you agree to our Terms of Service and Privacy Policy, and you consent to receive offers and opportunities from Career Karma by telephone, text message, and email. This means you dont have to generate data over again when working with a program. Making statements based on opinion; back them up with references or personal experience. I don't know if there's an easy way to look this up automatically in Python. Received a 'behavior reminder' from manager. The io module in Python is used for file handling. Where does the idea of selling dragon parts come from? Almost every application involves writing and reading operations to and from a file. How can I fix it? But now we will use read () method. The with block ensures that once the entire block is executed the file is closed automatically. While weve read our file into a list, we have a problem: each line is stored in its own string. The file opened is closed using the close() method. You can read a text file using the open() and readlines() methods. Application software. The second value is the name of the ingredient. Something can be done or not a fit? About us: Career Karma is a platform designed to help job seekers find, research, and connect with job training programs to advance their careers. the .strip() is used for each line of the file to remove \n newline character that each line might have. There's an extra complication when the string has \ in it, because that's a special string escape character to Python. Alternately, you could save in another format such as JSON or even a python pickle file. We will read this file using a Python file.read() function and split the string into the list. Could be a potential issue when this is called inside a function opening thousands of files. A specialized Writer that writes to a file in the file system. This means you don't have to generate data over again when working with a program. The simplest method of opening and reading a file is as follows: file= open("newline.txt", "r") file.read() # 'Hello\nmy\nname\nis\nRikesh.\n' Using this method we can see that the newline is being read by Python and represented by the '\n' character. Why is the federal judiciary of the United States divided into circuits? There are many ways to read text file into lists in python. Kindle Scribe: 9 tips and tricks you need to know. ), then you can have python parse them again. The open() method supports various modes of which three are of main concern: write(): Inserts the string str1 in a single line in the text file. The pythonic way to read a file and put every lines in a list: Then, assuming that each lines contains a number. data_into_list = data.split ("\n") print(data_into_list) my_file.close () Output: Our file content looks like this: The first column in our file contains the quantity of each ingredient to be used. Python - Tell and Seek. Syntax file .read () Parameter Values More examples Example Was the ZX Spectrum used for number crunching? The separator to be used in the given case is ",". Call read () method on the file object. The access mode opens a file in write mode. Connect and share knowledge within a single location that is structured and easy to search. Use the np.loadtxt() function to write your text into an array and the file object read() function to populate a Python list #1 Data Preparation The other list contains the ingredients well use for the recipe. How do I concatenate two lists in Python? The read text can be stored into a variable which will be a string. You need to pass a filename string to open. One of the most common tasks that you can do with Python is reading and writing files. Each of the bounds will have only 5 lat,long pairs. You saved a string representation of the list. I feel what I present in sample 3 is not unrelated! You can use these examples with python3 (Python 3) version. The rubber protection cover does not pass through the hole in the rim. The open () function accepts two essential parameters: the file name and the mode; the default mode is 'r', which opens the file for reading only. Read mode is denoted by the r character in our open() statement. The file is opened using the open() method in reading r mode. Now that weve made this change, our program is ready: Our code successfully transforms our text file into two lists. In Python, the contents of the file are a sequence of characters. Find centralized, trusted content and collaborate around the technologies you use most. I.e. Python File read () Method File Methods Example Read the content of the file "demofile.txt": f = open("demofile.txt", "r") print(f.read ()) Run Example Definition and Usage The read () method returns the specified number of bytes from the file. Asking for help, clarification, or responding to other answers. Look over here. Lets see how to read a file into a list. What's the \synctex primitive? How does the Chameleon's Arcane/Divine focus interact with magic item crafting? SendTextMessage("@channelname or chat_id", "text message");. readlines () This method reads all the lines and return them as the list of strings. Reading File Data with List Comprehension. Site design / logo 2022 Stack Exchange Inc; user contributions licensed under CC BY-SA. Apply to top tech training programs in one click, Python TypeError: function object is not subscriptable Solution, Best Coding Bootcamp Scholarships and Grants, Get Your Coding Bootcamp Sponsored by Your Employer, Python FileNotFoundError: [Errno 2] No such file or directory Solution, Python ValueError: I/O operation on closed file Solution, Python PermissionError: [errno 13] permission denied Solution, Career Karma matches you with top tech bootcamps, Access exclusive scholarships and prep courses. Add a new light switch in line with another switch? CGAC2022 Day 10: Help Santa sort presents! Python list comprehension provides an elegant solution for working with lists. 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How does legislative oversight work in Switzerland when there is technically no "opposition" in parliament? document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); This site uses Akismet to reduce spam. This method lets us divide a string using a separator character we specify. Does integrating PDOS give total charge of a system? Go ahead and send a message to your bot. I have a list of lists in a text file, when I read it into python, how do I assign it to a variable as a list rather then a string? Use the str.split(separator) function with this string to return a list of values containing each text of the file as a separate item. The read () method iterates over every single character, that means read () method reads character wise. We read this file into our code using the open() and readlines() methods: In our code, we open a file called grilled_cheese.txt in read mode. python read file line by line into list; python best way to read all lines; python how do you say for each line in file; read line; how to take a text file and put each line into a list; write a method in python to read lines from a text file in.txt; python read array line by line; python read file line by line; count lines in a file; python . The readlines() function returns all the lines in the file as a list where each line is an item in the list object. Normally unused variables are garbage collected by python interpreter. Python has a built-in open() function that returns a file-like object which acts as an iterator. Then there is also the fileinput module that can be used for the purpose.. Is it appropriate to ignore emails from a student asking obvious questions? Is it illegal to use resources in a University lab to prove a concept could work (to ultimately use to create a startup). Thanks for contributing an answer to Stack Overflow! Saving previous strings? Without any further ado, let's see the below code examples below one by one. Edit: The edits to the question make it completely different from the original, and since none of them was from the original poster I'm not sure they're warrented. We then print both of these lists to the console: Our code prints three lists to the console. Learn about the CK publication. Well refer to an example so you can get started reading text files into lists quickly. If you have multiple numbers per line and you have multiple lines, you can read them in like this: Site design / logo 2022 Stack Exchange Inc; user contributions licensed under CC BY-SA. Explore your training options in 10 minutes Matplotlib uses basemap to plot data on map projections. How to compare and merge text files with differing column numbers? Is the EU Border Guard Agency able to tell Russian passports issued in Ukraine or Georgia from the legitimate ones? i will give you two examples using readlines () function and read () function to read text file in list in python. Connect and share knowledge within a single location that is structured and easy to search. Storing data in files lets you keep a record of the data with which a program is working. Generally, to read file content as a string, follow these steps. Call read () method on the file object. read () returns a string. Create a list or array from a text file in Python. To solve this problem, we use the split() method. This is the pythonic way of opening and reading files. Python file1 = open("MyFile.txt","a") file1.close () Writing to a file There are two ways to write in a file. >>> myFile.seek(offset, [start_from]) I'm using the following code to try to read the file into a list: text_file = open ("filename.dat", "r") lines = text_file.readlines () print lines print len (lines) text_file.close () The output I get is: ['0,0,200,0,53,1,0,255,.,0.'] 1 Apparently it is reading the entire file into a list of just one item, rather than a list of individual items. Well iterate over our list so we can access each line of text from our file. The data read from the file is printed to the output screen using readlines() function. this will give you a list of values (strings) you had in your file, with newlines stripped. You can strip off this newline-character by using the strip()-method. How do I make a flat list out of a list of lists? In addition, list comprehension statements are usually easier to read. The file is opened using the open() method in reading r mode. How "with" is better than try/catch to open a file in Python? Note that file closing is implementation dependent. From there, you can go further with your data and visualize it. Ready to optimize your JavaScript with Rust? Open file in write mode Pass file path and access mode w to the open () function. 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